Checkerwork for hot-blast stoves.



A. J. BOYNTON. CHECKEHWURK FOR HOT BLAST STOVES.

APPLICATION-FILE FEB. 17, 191?.

Patented @et 1G, 19V? INVENTOR WITN ESSES ARTHUR a'. Bovivrou, or Loaarrt, entre.

CHECKERWOIB/K FOR HOT-BLAST ST'VES.

Specification of Letters Patent.

Application led February 17, 1917. Serial No. 149,289.

. To au V0f/tcm' t may concern.'

Be it known that l, ARTHUR J. BoYNfroN, a citizen ofthe United States, and resident of Lorain, in the county of Lorain and State of Ohio, have invented certain new and useful lmprovements in Gheckerwork for Hot-Blast Stoves, of which the following isea. specification. 'l

This invention relates to the construction of hot blast stoves and more particularly to the construction of the stove checkerivork.

As constructed heretofore, it was the practice to make the transverse dimensions of the vertical passages in the checkerwork of the hot blast stoves somewhat larger than that which is most economical from the standpoint of hot-blast heating capacity. This was done to lessen the frequency with which accumulations of flue dust from the vertical'surfaces of the passages must be removed, and reduce the cost of cleaning the stoves. L

To reduce the size of the vertical passages requires increase in the thickness of the bricks at the expense of heatinfT surface or else reducing vthe sizey of thcbbricks and greatly increasing the number of joints in the integrated checkerwork. To lessen the' thickness of the bricks of whichthecheckerwork is formed decreases the bearing surfaces of the individual bricksso as to impair the durability of the checkerwork.

The transverse dimensions of the vertical passages l0 were determined by experiment as to the time interval in which the surfaces of the passages became clogged to an extent requiring cleaning, a small passage necessif tating more frequent cleaning than larger ones.

The thickness of the bricks forming the checkerwork was determined largely by the crushing strength of the refractory material of which they are formed, so that the thickness cannot be lessened beyond that which will give an ample bearing surface.'

The greater the heating surface of the stove checkerwork the greater the heatingl capacity of the stove will be, but at the same l time the number of joints in the integrated structure will be very materially increased by the use of the smaller passages'unless j heating capacity is sacrificed by making the bricks thicker than necessary.'

ln modern blast furnace plants the combustible blast furnace gases hurned in the stoves in heating the checkerwork are dry cleaned or washed so that most ofthe iinely vlarge passages in the stoves in cleaning the The life of the,

stoves does not exist. checkerwork in such stoves extends over long time intervals, and the cost ofrelining a stove and supplying new checkerwork is very great. r I

The primary object of thev invention is to provide a hot blast stove checkerwork of improved construction whereby the heating capacity of thestove is materially increased Without increase in the number" of joints .or decrease in the strength of the integrated checkerwork. j

Another object of the invention is to provide novel means for increasing the heating capacity of existing stoves at a minimum expense and without disturbance of the stove checkerwork.

A further object of this invention is the provision of a stove checkerwork having the novel constructions, combinations, and arrangements of parts shown in the drawings, to he more fully described hereinafter and to be particularly pointed out in the appended claims.

a refractory checkerwork having a series of'.

vertical passages formed therein with the ends of the bricks of the checkerwork in overlapping or interlocking engagement'so as'to integrate the structure'and in providing in the vertical passages vertical partitions formed of superposed bricks lwhich are independently supported, are separate from the integrated checkerwork and which are maintained in superposed position by contact with the side surfacesv of the vertical passages. i

i Referring now to the drawingsforming part of -this specification, Figure l is a horizontal section showing a hot blast stove having a wellknown and preferred arrange ment of checkerwork as modified to embodyT my invention.v

' Fig. '2 is a perspective view showing details in a preferred construction and arrangement of the partitions in the passages of the checkerwork as made in accordance I with this invention.

Patenten oet. ie, iaia llt ftically alined position.

ln the accompanying drawings the nii* moral 2 designates the cylindrical metal generally by the numeral 5) which arev formed in the refractory lining 3, a solid `W all o separating tbe chamber fl. from the chamber 5. il removable lining Wall 7 is provided in the combustion chamber il.

rlfhe space comprising the checkervvork chamber 5 is iilled with the checkervvork which is built of rectangular bricks 8 having notched ends 9 which overlap and which are laid, without grout or mortar, to form a multiplicity of vertical passages 10 (see llig. 2), these passages extending from a point a short distance above the bottom of thestove to a point near its top.

Within the vertical passages 10 of stove checkerwork made in accordance with my invention partitions are formed by superposed bricks 1l which extend vertically Within the passages l0 and are supported at the Vlower end of the vertical passages l0 in any suitable manner. ils shown the bricks ll forming the partition have beveled endsand extend diagonally from corner to corner of the rectangular passages lOLthe charnfered faces l2, 12 of the bricks contacting with the side surfaces of the bricks 8 to maintain the snperposed bricks il in verln this Way [the heating surface of the stovesis materially increased at slight expense and Without adding to the number of joints in the loosely bonded checkervvork or necessitating any reduction in the thickness or other dimensions of the bricks forming the checkervvork.

lt will be noted by reference to Fig. :2 that the notched ends 9 of the bricks 8 are ,in interlocking or overlapping engagements() as to forma loosely bonded or integrated structure. That is to say, the individual bricks 8 forming the checkerwork are tied together by their overlapping notched ends so that the structure must be razed to remove any particular brick other than .those in the top course of checker bricks. ltA Will be obvious, however, that an integrated checker- Work may be built in other approved Ways.

ln constructing stoves embodying my invention, the partition bricks ll are inserted Within the rectangular vertically extending passages 10 as the passages are formed. With existing stoves the bricks 1l are inserted Within the passages 10 frornthe top of the stove, being lowered Within the passagesand positioned one on top of another to form the diagonal partitions, Without disturbing the bricks 8 of the checkeryvork.

Lea-acei- The advantages of my invention Will be appreciatedv by those skilled in the art. By

means of my invention the heating capacity ,v

of the hot blast 'stoves is materially increased (in some cases as much as forty per Modiiications in the construction and arrangement of the checkerivork and the partitions Within the vertical passages of the checkerwork may be made Without departf ing from my invention as deiined in the appended claims.'

l claim A f l. ln a. hot blast stove, an integrated checkervvork having a series of vertical passages therein and separate and independ` ently supported partitions Within at least part of said vvertical passages, said partitions beingloosely mounted in the passages and being maintained in ,vertical position by contact With the side surfaces of said passages. Y

2. ln a hot blast stove, an integrated checkervvork having a series of vertical passages therein and separate and independently supported partitions Within the passages, said partitions being held in place by contact with the side surfaces of said passages.

3. l'n a hot blast stove, a checkerwork comprising an integrated structure having a plurality of vertical passages therein and separate' partitions Within at least part of said passages, said partitions being' supce e 'ice' ported independently of the integrated structure and being maintained in vertical.

5. ln a hot blast stove, a checkerwork having vertically `extending rectangular passages therein, and diagonal partitions Within said passages, said partitions having chamfere'd ends engaging With the sideesuracesvof the passages at the corners thereof. 6. ln a hot blast stove, an integrated checkerwork having a series of vertical 'pas'f sages therein and separate and independfently supported partitions Within the passages.

f' norrrron.

my hand.

ln testirnony whereof l have hereunto set 

